Below you can find the Launched in 1999 the stardust mission used this silicon-based substance to help collect comet dust Jeopardy Words Answer. The answer to Launched in 1999 the stardust mission used this silicon-based substance to help collect comet dust has 7 letters. This clue belongs to the Comet probes category and is part of Jeopardy Word Level 1874. If you scroll near the bottom you will find other clues and answers part of level 1874